Positive preserving scheme (SSP & limiter )

cosine bells with $q \in [0, 1]$ , the setup in the main is $q \in [0.1, 1]$, so no negative value is observed

extrema with 12 day / 1200 steps: ne = 6 ne = 16
(-4.33710126096385e-22, 0.7604223043784831) (-5.501461995104536e-5, 0.9508024233242366)

extrema with 120 day / 12000 steps: ne = 6 ne = 16
(0.001258494405958857, 0.06971253964379465) (-0.005024378170539984, 0.10875800730425647))

The modified branch is dzh/limiter-issue,
```
examples/sphere/limiters_advection.jl
```